Java Map Add addToMapOfLists(Map> map, S key, T value)

Description

add To Map Of Lists

License

Apache License

Declaration

public static <S, T> void addToMapOfLists(Map<S, List<T>> map, S key, T value) 

Method Source Code

//package com.java2s;
/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License./*from  w  w w  .j a  v  a 2s . c o m*/
 */

import java.util.ArrayList;

import java.util.List;
import java.util.Map;

public class Main {
    public static <S, T> void addToMapOfLists(Map<S, List<T>> map, S key, T value) {
        List<T> list = map.get(key);
        if (list == null) {
            list = new ArrayList<T>();
            map.put(key, list);
        }
        list.add(value);
    }
}

Related

1. addToMapIfNotNull(Map map, K key, V value)
2. addToMapIfNotNull(Map map, String key, Object value)
3. addToMapListUnique(Map> mapList, T key, List values)
4. addToMapMap(Map> map, K1 key1, K2 key2, V value)
5. addToMapMap(Map> map, T key, V val)
6. arrayAsMap(Object... t)
7. arrayToMap(int[] array)
8. arrayToMap(Map destMap, Object[]... oaaArray)
9. ArrayToMap(Object[] a)